Incoherence in our minds leads to mental corrosion, distortions and confusion, all a function of the toxin of the Etz HaDa'at. The structure of Psukei DeZimra is meant to heal this on the level of Yetzira, the world of emotional conviction. This allows us to move away from perfectionism to real evolution.

Shulhan Arukh Orah Hayim 53:2.